Tsh went from 6.43 to 3.98 within a few months. T4 is 1.4, triiodothyronine 2.9 (2-4.4). Tpo ab went from 9 to 6 on the second test as well. Hashi's?

Maybe. People with Hashimoto's can swing from hypo to hyper. There are other antibodies that can be tested, and reverse T3 (liothyronine) was not done. More info: http://drfairchild.blogspot.com/2012/12/thyroid-testing-and-treatment.html.